power: qpnp-smbcharger: update the delay on usb_rid change

The delay between an usbid interrupt and the ADC finishing the
conversion is tested to be up to 15 milliseconds. Wait for at least that
long to ensure the RID value read from the peripheral is correct and
updated.

CRs-Fixed: 711843
Change-Id: I912bc41944805c3ce3fec212a248d4710aa4a124
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>